Django - posts.Post.None - django

Question

I am working on a django project and I have 2 models that look like this:
class Playlist(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE,related_name='playlist_user')
name = models.CharField(max_length=120)
image = models.ImageField(upload_to=upload_image_path)
genre = models.CharField(max_length=120,null=True,blank=True)
track = models.ManyToManyField('Post',related_name='playlist_track')
class Post(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
title = models.CharField(max_length=120)
slug = models.SlugField(unique=True)
image = models.ImageField(upload_to=upload_image_path)
audiofile = models.FileField(upload_to=upload_image_path,null=True)
genre = models.CharField(max_length=120,null=True,blank=True)
and this view:
def userprofileview(request):
own_tracks = Post.objects.filter(user=request.user)
playlist_ = Playlist.objects.filter(user=request.user)
context = {
'own_tracks':own_tracks,
'playlist_':playlist_
}
return render(request,'userprofile.html',context)
but when I try to query the posts from the playlist like this:
{% for object in playlist_ %}
{{ object.track }}
{% endfor %}
I get:
posts.Post.None
Thank you for any suggestions

Answer 1

In order to access the related objects, you need to add .all at the end:
{% for object in playlist_ %}
{% for post in object.track.all %}
{{ post.title }}
{% endfor %}
{% endfor %}
To avoid the N+1 problem, you can use .prefetch_related(..) [Django-doc]:
def userprofileview(request):
own_tracks = Post.objects.filter(user=request.user)
playlist_ = Playlist.objects.filter(user=request.user).prefetch_related('post')
context = {
'own_tracks':own_tracks,
'playlist_':playlist_
}
return render(request,'userprofile.html',context)